42977540 has 12 divisors (see below), whose sum is σ = 90252876. Its totient is φ = 17191008.

The previous prime is 42977531. The next prime is 42977551. The reversal of 42977540 is 4577924.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 30118144 = 3586^2 + 5488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42977494 and 42977503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074419 + ... + 1074458.

It is an arithmetic number, because the mean of its divisors is an integer number (7521073).

Almost surely, 2^42977540 is an apocalyptic number.

It is an amenable number.

42977540 is an abundant number, since it is smaller than the sum of its proper divisors (47275336).

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

42977540 is a wasteful number, since it uses less digits than its factorization.

42977540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148886 (or 2148884 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 42977540 is about 6555.7257416704. The cubic root of 42977540 is about 350.2787982678.

The spelling of 42977540 in words is "forty-two million, nine hundred seventy-seven thousand, five hundred forty".