30400725 has 12 divisors (see below), whose sum is σ = 50262656. Its totient is φ = 16213680.

The previous prime is 30400723. The next prime is 30400757. The reversal of 30400725 is 52700403.

It is a happy number.

It is not a de Polignac number, because 30400725 - 2¹ = 30400723 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30400723) 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, 202597 + ... + 202746.

Almost surely, 2^30400725 is an apocalyptic number.

It is an amenable number.

30400725 is a deficient number, since it is larger than the sum of its proper divisors (19861931).

30400725 is a wasteful number, since it uses less digits than its factorization.

30400725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405356 (or 405351 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 30400725 is about 5513.6852467293. The cubic root of 30400725 is about 312.1006311653.

It can be divided in two parts, 30400 and 725, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 30400725 in words is "thirty million, four hundred thousand, seven hundred twenty-five".