40257420 has 72 divisors (see below), whose sum is σ = 131133744. Its totient is φ = 9201024.

The previous prime is 40257403. The next prime is 40257421. The reversal of 40257420 is 2475204.

It is not an unprimeable number, because it can be changed into a prime (40257421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3907 + ... + 9786.

It is an arithmetic number, because the mean of its divisors is an integer number (1821302).

Almost surely, 2^40257420 is an apocalyptic number.

It is an amenable number.

40257420 is an abundant number, since it is smaller than the sum of its proper divisors (90876324).

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

40257420 is a wasteful number, since it uses less digits than its factorization.

40257420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13719 (or 13710 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 40257420 is about 6344.8735211980. The cubic root of 40257420 is about 342.7272578454.

The spelling of 40257420 in words is "forty million, two hundred fifty-seven thousand, four hundred twenty".