1387626261 has 32 divisors (see below), whose sum is σ = 2163179520. Its totient is φ = 774725376.

The previous prime is 1387626239. The next prime is 1387626293. The reversal of 1387626261 is 1626267831.

It is not a de Polignac number, because 1387626261 - 2¹⁰ = 1387625237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387628261) 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, 963580 + ... + 965018.

It is an arithmetic number, because the mean of its divisors is an integer number (67599360).

Almost surely, 2^1387626261 is an apocalyptic number.

It is an amenable number.

1387626261 is a deficient number, since it is larger than the sum of its proper divisors (775553259).

1387626261 is a wasteful number, since it uses less digits than its factorization.

1387626261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473.

The product of its digits is 145152, while the sum is 42.

The square root of 1387626261 is about 37250.8558425172. The cubic root of 1387626261 is about 1115.3833830795.

The spelling of 1387626261 in words is "one billion, three hundred eighty-seven million, six hundred twenty-six thousand, two hundred sixty-one".