1639842144 has 36 divisors (see below), whose sum is σ = 4305627396. Its totient is φ = 546481792.

The previous prime is 1639842131. The next prime is 1639842157. The reversal of 1639842144 is 4412489361.

It is an interprime number because it is at equal distance from previous prime (1639842131) and next prime (1639842157).

It is a junction number, because it is equal to n+sod(n) for n = 1639842096 and 1639842105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394702 + ... + 398834.

It is an arithmetic number, because the mean of its divisors is an integer number (119600761).

Almost surely, 2^1639842144 is an apocalyptic number.

It is an amenable number.

1639842144 is an abundant number, since it is smaller than the sum of its proper divisors (2665785252).

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

1639842144 is an frugal number, since it uses more digits than its factorization.

1639842144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8279 (or 4138 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 1639842144 is about 40494.9644276915. The cubic root of 1639842144 is about 1179.2358703104.

The spelling of 1639842144 in words is "one billion, six hundred thirty-nine million, eight hundred forty-two thousand, one hundred forty-four".