305139357 has 12 divisors (see below), whose sum is σ = 441727260. Its totient is φ = 202978368.

The previous prime is 305139313. The next prime is 305139371. The reversal of 305139357 is 753931503.

It is a happy number.

305139357 is a `hidden beast` number, since 3 + 0 + 513 + 93 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 188952516 + 116186841 = 13746^2 + 10779^2 .

It is not a de Polignac number, because 305139357 - 2⁸ = 305139101 is a prime.

It is a super-2 number, since 2×305139357² = 186220054380746898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305139377) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32982 + ... + 41207.

It is an arithmetic number, because the mean of its divisors is an integer number (36810605).

Almost surely, 2^305139357 is an apocalyptic number.

It is an amenable number.

305139357 is a deficient number, since it is larger than the sum of its proper divisors (136587903).

305139357 is a wasteful number, since it uses less digits than its factorization.

305139357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74652 (or 74649 counting only the distinct ones).

The product of its (nonzero) digits is 42525, while the sum is 36.

The square root of 305139357 is about 17468.2385202401. The cubic root of 305139357 is about 673.2340538906.

The spelling of 305139357 in words is "three hundred five million, one hundred thirty-nine thousand, three hundred fifty-seven".