42974040 has 64 divisors (see below), whose sum is σ = 129800160. Its totient is φ = 11381760.

The previous prime is 42974033. The next prime is 42974047. The reversal of 42974040 is 4047924.

It is an interprime number because it is at equal distance from previous prime (42974033) and next prime (42974047).

It is a super-2 number, since 2×42974040² = 3693536227843200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 42973989 and 42974007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42974047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17700 + ... + 19980.

Almost surely, 2^42974040 is an apocalyptic number.

42974040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42974040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64900080).

42974040 is an abundant number, since it is smaller than the sum of its proper divisors (86826120).

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

42974040 is a wasteful number, since it uses less digits than its factorization.

42974040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452 (or 2448 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 42974040 is about 6555.4587940128. The cubic root of 42974040 is about 350.2692893548.

The spelling of 42974040 in words is "forty-two million, nine hundred seventy-four thousand, forty".