30157749 has 24 divisors (see below), whose sum is σ = 44959200. Its totient is φ = 19468512.

The previous prime is 30157727. The next prime is 30157789. The reversal of 30157749 is 94775103.

It is a happy number.

It is not a de Polignac number, because 30157749 - 2⁵ = 30157717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30157789) 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, 57402 + ... + 57924.

It is an arithmetic number, because the mean of its divisors is an integer number (1873300).

Almost surely, 2^30157749 is an apocalyptic number.

It is an amenable number.

30157749 is a deficient number, since it is larger than the sum of its proper divisors (14801451).

30157749 is a wasteful number, since it uses less digits than its factorization.

30157749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 30157749 is about 5491.6071418119. The cubic root of 30157749 is about 311.2669241293.

The spelling of 30157749 in words is "thirty million, one hundred fifty-seven thousand, seven hundred forty-nine".