42731690 has 16 divisors (see below), whose sum is σ = 77524992. Its totient is φ = 16957584.

The previous prime is 42731687. The next prime is 42731743. The reversal of 42731690 is 9613724.

It is a super-2 number, since 2×42731690² = 3651994660512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15554 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (4845312).

Almost surely, 2^42731690 is an apocalyptic number.

42731690 is a deficient number, since it is larger than the sum of its proper divisors (34793302).

42731690 is a wasteful number, since it uses less digits than its factorization.

42731690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33781.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 42731690 is about 6536.9480646552. The cubic root of 42731690 is about 349.6096055272.

The spelling of 42731690 in words is "forty-two million, seven hundred thirty-one thousand, six hundred ninety".