42400881 has 32 divisors (see below), whose sum is σ = 65472000. Its totient is φ = 27098064.

The previous prime is 42400861. The next prime is 42400889. The reversal of 42400881 is 18800424.

It is not a de Polignac number, because 42400881 - 2⁵ = 42400849 is a prime.

It is a super-2 number, since 2×42400881² = 3595669419152322, which contains 22 as substring.

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 (42400889) 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, 68190 + ... + 68808.

It is an arithmetic number, because the mean of its divisors is an integer number (2046000).

Almost surely, 2^42400881 is an apocalyptic number.

It is an amenable number.

42400881 is a deficient number, since it is larger than the sum of its proper divisors (23071119).

42400881 is a wasteful number, since it uses less digits than its factorization.

42400881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 42400881 is about 6511.5958873382. The cubic root of 42400881 is about 348.7050953862.

The spelling of 42400881 in words is "forty-two million, four hundred thousand, eight hundred eighty-one".