42400345 has 16 divisors (see below), whose sum is σ = 55964160. Its totient is φ = 30642624.

The previous prime is 42400321. The next prime is 42400357. The reversal of 42400345 is 54300424.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42400345 is a prime.

It is a super-2 number, since 2×42400345² = 3595578512238050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3885 + ... + 9994.

It is an arithmetic number, because the mean of its divisors is an integer number (3497760).

Almost surely, 2^42400345 is an apocalyptic number.

It is an amenable number.

42400345 is a deficient number, since it is larger than the sum of its proper divisors (13563815).

42400345 is a wasteful number, since it uses less digits than its factorization.

42400345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13944.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42400345 is about 6511.5547298629. The cubic root of 42400345 is about 348.7036260242.

Adding to 42400345 its reverse (54300424), we get a palindrome (96700769).

The spelling of 42400345 in words is "forty-two million, four hundred thousand, three hundred forty-five".