1387615401 has 16 divisors (see below), whose sum is σ = 2066169600. Its totient is φ = 920377584.

The previous prime is 1387615399. The next prime is 1387615433. The reversal of 1387615401 is 1045167831.

1387615401 is a `hidden beast` number, since 1 + 38 + 7 + 615 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 1387615401 - 2¹ = 1387615399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1387615501) 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, 125121 + ... + 135758.

It is an arithmetic number, because the mean of its divisors is an integer number (129135600).

Almost surely, 2^1387615401 is an apocalyptic number.

It is an amenable number.

1387615401 is a deficient number, since it is larger than the sum of its proper divisors (678554199).

1387615401 is a wasteful number, since it uses less digits than its factorization.

1387615401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261085 (or 261079 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1387615401 is about 37250.7100737691. The cubic root of 1387615401 is about 1115.3804732914.

The spelling of 1387615401 in words is "one billion, three hundred eighty-seven million, six hundred fifteen thousand, four hundred one".