1387625770 has 16 divisors (see below), whose sum is σ = 2506620168. Its totient is φ = 553073920.

The previous prime is 1387625761. The next prime is 1387625773. The reversal of 1387625770 is 775267831.

It can be written as a sum of positive squares in 4 ways, for example, as 1236999241 + 150626529 = 35171^2 + 12273^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1387625770.

It is not an unprimeable number, because it can be changed into a prime (1387625773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244099 + ... + 249718.

Almost surely, 2^1387625770 is an apocalyptic number.

1387625770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387625770 is a deficient number, since it is larger than the sum of its proper divisors (1118994398).

1387625770 is a wasteful number, since it uses less digits than its factorization.

1387625770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494105.

The product of its (nonzero) digits is 493920, while the sum is 46.

The square root of 1387625770 is about 37250.8492520640. The cubic root of 1387625770 is about 1115.3832515231.

The spelling of 1387625770 in words is "one billion, three hundred eighty-seven million, six hundred twenty-five thousand, seven hundred seventy".