42400440 has 48 divisors (see below), whose sum is σ = 137802600. Its totient is φ = 11306688.

The previous prime is 42400427. The next prime is 42400459. The reversal of 42400440 is 4400424.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58530 + ... + 59249.

Almost surely, 2^42400440 is an apocalyptic number.

42400440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42400440 is an abundant number, since it is smaller than the sum of its proper divisors (95402160).

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

42400440 is a wasteful number, since it uses less digits than its factorization.

42400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117796 (or 117789 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 42400440 is about 6511.5620245837. The cubic root of 42400440 is about 348.7038864531.

Adding to 42400440 its reverse (4400424), we get a palindrome (46800864).

The spelling of 42400440 in words is "forty-two million, four hundred thousand, four hundred forty".