1387480731 has 32 divisors (see below), whose sum is σ = 2289692160. Its totient is φ = 727743744.

The previous prime is 1387480709. The next prime is 1387480741. The reversal of 1387480731 is 1370847831.

It is a happy number.

It is not a de Polignac number, because 1387480731 - 2⁷ = 1387480603 is a prime.

It is a super-2 number, since 2×1387480731² = 3850205557792588722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1387480741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34671 + ... + 63063.

It is an arithmetic number, because the mean of its divisors is an integer number (71552880).

Almost surely, 2^1387480731 is an apocalyptic number.

1387480731 is a deficient number, since it is larger than the sum of its proper divisors (902211429).

1387480731 is a wasteful number, since it uses less digits than its factorization.

1387480731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28595.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 1387480731 is about 37248.9024133598. The cubic root of 1387480731 is about 1115.3443890498.

The spelling of 1387480731 in words is "one billion, three hundred eighty-seven million, four hundred eighty thousand, seven hundred thirty-one".