1387901650 has 48 divisors (see below), whose sum is σ = 2734092864. Its totient is φ = 523068480.

The previous prime is 1387901629. The next prime is 1387901659. The reversal of 1387901650 is 561097831.

It is not an unprimeable number, because it can be changed into a prime (1387901659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68044 + ... + 86056.

It is an arithmetic number, because the mean of its divisors is an integer number (56960268).

Almost surely, 2^1387901650 is an apocalyptic number.

1387901650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387901650 is a deficient number, since it is larger than the sum of its proper divisors (1346191214).

1387901650 is a wasteful number, since it uses less digits than its factorization.

1387901650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18115 (or 18110 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 1387901650 is about 37254.5520708544. The cubic root of 1387901650 is about 1115.4571647130.

The spelling of 1387901650 in words is "one billion, three hundred eighty-seven million, nine hundred one thousand, six hundred fifty".