42051690 has 32 divisors (see below), whose sum is σ = 112138560. Its totient is φ = 11213712.

The previous prime is 42051689. The next prime is 42051697. The reversal of 42051690 is 9615024.

It is a super-2 number, since 2×42051690² = 3536689263712200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42051697) 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, 77604 + ... + 78143.

It is an arithmetic number, because the mean of its divisors is an integer number (3504330).

Almost surely, 2^42051690 is an apocalyptic number.

42051690 is an abundant number, since it is smaller than the sum of its proper divisors (70086870).

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

42051690 is a wasteful number, since it uses less digits than its factorization.

42051690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155763 (or 155757 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 42051690 is about 6484.7274422292. The cubic root of 42051690 is about 347.7452058837.

The spelling of 42051690 in words is "forty-two million, fifty-one thousand, six hundred ninety".