1387231970 has 16 divisors (see below), whose sum is σ = 2521742328. Its totient is φ = 549398400.

The previous prime is 1387231969. The next prime is 1387231981. The reversal of 1387231970 is 791327831.

It can be written as a sum of positive squares in 4 ways, for example, as 1386892081 + 339889 = 37241^2 + 583^2 .

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, 685739 + ... + 687758.

Almost surely, 2^1387231970 is an apocalyptic number.

1387231970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387231970 is a deficient number, since it is larger than the sum of its proper divisors (1134510358).

1387231970 is a wasteful number, since it uses less digits than its factorization.

1387231970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373605.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1387231970 is about 37245.5630914610. The cubic root of 1387231970 is about 1115.2777284799.

The spelling of 1387231970 in words is "one billion, three hundred eighty-seven million, two hundred thirty-one thousand, nine hundred seventy".