42402040 has 16 divisors (see below), whose sum is σ = 95404680. Its totient is φ = 16960800.

The previous prime is 42402023. The next prime is 42402043. The reversal of 42402040 is 4020424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42402043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529986 + ... + 530065.

Almost surely, 2^42402040 is an apocalyptic number.

42402040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42402040 is an abundant number, since it is smaller than the sum of its proper divisors (53002640).

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

42402040 is a wasteful number, since it uses less digits than its factorization.

42402040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060062 (or 1060058 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42402040 is about 6511.6848818105. The cubic root of 42402040 is about 348.7082725648.

Adding to 42402040 its reverse (4020424), we get a palindrome (46422464).

The spelling of 42402040 in words is "forty-two million, four hundred two thousand, forty".