201312440 has 32 divisors (see below), whose sum is σ = 517661280. Its totient is φ = 69021312.

The previous prime is 201312439. The next prime is 201312451. The reversal of 201312440 is 44213102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359207 + ... + 359766.

It is an arithmetic number, because the mean of its divisors is an integer number (16176915).

Almost surely, 2^201312440 is an apocalyptic number.

201312440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201312440 is an abundant number, since it is smaller than the sum of its proper divisors (316348840).

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

201312440 is a wasteful number, since it uses less digits than its factorization.

201312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718991 (or 718987 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 201312440 is about 14188.4615092687. The cubic root of 201312440 is about 586.0799589588.

Adding to 201312440 its reverse (44213102), we get a palindrome (245525542).

The spelling of 201312440 in words is "two hundred one million, three hundred twelve thousand, four hundred forty".