1357879905 has 24 divisors (see below), whose sum is σ = 2434821480. Its totient is φ = 699229440.

The previous prime is 1357879903. The next prime is 1357879907. The reversal of 1357879905 is 5099787531.

It is an interprime number because it is at equal distance from previous prime (1357879903) and next prime (1357879907).

It can be written as a sum of positive squares in 4 ways, for example, as 584817489 + 773062416 = 24183^2 + 27804^2 .

It is not a de Polignac number, because 1357879905 - 2¹ = 1357879903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1357879903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 518956 + ... + 521565.

It is an arithmetic number, because the mean of its divisors is an integer number (101450895).

Almost surely, 2^1357879905 is an apocalyptic number.

1357879905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1357879905 is a deficient number, since it is larger than the sum of its proper divisors (1076941575).

1357879905 is a wasteful number, since it uses less digits than its factorization.

1357879905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040561 (or 1040558 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 54.

The square root of 1357879905 is about 36849.4220443143. The cubic root of 1357879905 is about 1107.3556361586.

The spelling of 1357879905 in words is "one billion, three hundred fifty-seven million, eight hundred seventy-nine thousand, nine hundred five".