1379999731 has 16 divisors (see below), whose sum is σ = 1554157440. Its totient is φ = 1214478720.

The previous prime is 1379999723. The next prime is 1379999741.

1379999731 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1379999731 - 2³ = 1379999723 is a prime.

It is a super-2 number, since 2×1379999731² = 3808798515120144722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1379999741) 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, 40540 + ... + 66358.

It is an arithmetic number, because the mean of its divisors is an integer number (97134840).

Almost surely, 2^1379999731 is an apocalyptic number.

1379999731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1379999731 is a deficient number, since it is larger than the sum of its proper divisors (174157709).

1379999731 is a wasteful number, since it uses less digits than its factorization.

1379999731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25986.

The product of its digits is 2893401, while the sum is 58.

The square root of 1379999731 is about 37148.3476213950. The cubic root of 1379999731 is about 1113.3362091810.

The spelling of 1379999731 in words is "one billion, three hundred seventy-nine million, nine hundred ninety-nine thousand, seven hundred thirty-one".