403721442 has 64 divisors (see below), whose sum is σ = 918489600. Its totient is φ = 131414400.

The previous prime is 403721419. The next prime is 403721447. The reversal of 403721442 is 244127304.

403721442 is a `hidden beast` number, since 403 + 7 + 214 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (403721447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430398 + ... + 431334.

It is an arithmetic number, because the mean of its divisors is an integer number (14351400).

Almost surely, 2^403721442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403721442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459244800).

403721442 is an abundant number, since it is smaller than the sum of its proper divisors (514768158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

403721442 is a wasteful number, since it uses less digits than its factorization.

403721442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 403721442 is about 20092.8206581356. The cubic root of 403721442 is about 739.0842348543.

Adding to 403721442 its reverse (244127304), we get a palindrome (647848746).

It can be divided in two parts, 40372 and 1442, that added together give a palindrome (41814).

The spelling of 403721442 in words is "four hundred three million, seven hundred twenty-one thousand, four hundred forty-two".