1387391070 has 64 divisors (see below), whose sum is σ = 3653584704. Its totient is φ = 335063040.

The previous prime is 1387391069. The next prime is 1387391101. The reversal of 1387391070 is 701937831.

It is a happy number.

It is a super-2 number, since 2×1387391070² = 3849707962231489800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12891 + ... + 54230.

It is an arithmetic number, because the mean of its divisors is an integer number (57087261).

Almost surely, 2^1387391070 is an apocalyptic number.

1387391070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387391070 is an abundant number, since it is smaller than the sum of its proper divisors (2266193634).

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

1387391070 is a wasteful number, since it uses less digits than its factorization.

1387391070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67197.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 1387391070 is about 37247.6988550971. The cubic root of 1387391070 is about 1115.3203634795.

The spelling of 1387391070 in words is "one billion, three hundred eighty-seven million, three hundred ninety-one thousand, seventy".