1639090442 has 24 divisors (see below), whose sum is σ = 2844710400. Its totient is φ = 705826440.

The previous prime is 1639090421. The next prime is 1639090447. The reversal of 1639090442 is 2440909361.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1639090396 and 1639090405.

It is not an unprimeable number, because it can be changed into a prime (1639090447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173642 + ... + 182837.

It is an arithmetic number, because the mean of its divisors is an integer number (118529600).

Almost surely, 2^1639090442 is an apocalyptic number.

1639090442 is a deficient number, since it is larger than the sum of its proper divisors (1205619958).

1639090442 is a wasteful number, since it uses less digits than its factorization.

1639090442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356522 (or 356511 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 1639090442 is about 40485.6819381865. The cubic root of 1639090442 is about 1179.0556559228.

The spelling of 1639090442 in words is "one billion, six hundred thirty-nine million, ninety thousand, four hundred forty-two".