30725421 has 4 divisors (see below), whose sum is σ = 40967232. Its totient is φ = 20483612.

The previous prime is 30725419. The next prime is 30725423. The reversal of 30725421 is 12452703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12452703 = 3 ⋅4150901.

It is an interprime number because it is at equal distance from previous prime (30725419) and next prime (30725423).

It is a cyclic number.

It is not a de Polignac number, because 30725421 - 2¹ = 30725419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30725391 and 30725400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30725423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5120901 + ... + 5120906.

It is an arithmetic number, because the mean of its divisors is an integer number (10241808).

Almost surely, 2^30725421 is an apocalyptic number.

It is an amenable number.

30725421 is a deficient number, since it is larger than the sum of its proper divisors (10241811).

30725421 is a wasteful number, since it uses less digits than its factorization.

30725421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10241810.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 30725421 is about 5543.0515963682. The cubic root of 30725421 is about 313.2078325168.

The spelling of 30725421 in words is "thirty million, seven hundred twenty-five thousand, four hundred twenty-one".