1989631626 has 32 divisors (see below), whose sum is σ = 4195083840. Its totient is φ = 627346944.

The previous prime is 1989631613. The next prime is 1989631639. The reversal of 1989631626 is 6261369891.

It is an interprime number because it is at equal distance from previous prime (1989631613) and next prime (1989631639).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63756 + ... + 89688.

It is an arithmetic number, because the mean of its divisors is an integer number (131096370).

Almost surely, 2^1989631626 is an apocalyptic number.

1989631626 is an abundant number, since it is smaller than the sum of its proper divisors (2205452214).

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

1989631626 is a wasteful number, since it uses less digits than its factorization.

1989631626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26630.

The product of its digits is 839808, while the sum is 51.

The square root of 1989631626 is about 44605.2869736313. The cubic root of 1989631626 is about 1257.7400545364.

The spelling of 1989631626 in words is "one billion, nine hundred eighty-nine million, six hundred thirty-one thousand, six hundred twenty-six".