1387520290 has 32 divisors (see below), whose sum is σ = 2704726080. Its totient is φ = 509444544.

The previous prime is 1387520249. The next prime is 1387520291. The reversal of 1387520290 is 920257831.

It is not an unprimeable number, because it can be changed into a prime (1387520291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6544 + ... + 53083.

It is an arithmetic number, because the mean of its divisors is an integer number (84522690).

Almost surely, 2^1387520290 is an apocalyptic number.

1387520290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387520290 is a deficient number, since it is larger than the sum of its proper divisors (1317205790).

1387520290 is a wasteful number, since it uses less digits than its factorization.

1387520290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59826.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1387520290 is about 37249.4334185099. The cubic root of 1387520290 is about 1115.3549889542.

The spelling of 1387520290 in words is "one billion, three hundred eighty-seven million, five hundred twenty thousand, two hundred ninety".