30872421 has 14 divisors (see below), whose sum is σ = 46288550. Its totient is φ = 20581128.

The previous prime is 30872419. The next prime is 30872437. The reversal of 30872421 is 12427803.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 236196 = 5535^2 + 486^2 .

It is not a de Polignac number, because 30872421 - 2¹ = 30872419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 (30872411) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 20446 + ... + 21903.

It is an arithmetic number, because the mean of its divisors is an integer number (3306325).

Almost surely, 2^30872421 is an apocalyptic number.

It is an amenable number.

30872421 is a deficient number, since it is larger than the sum of its proper divisors (15416129).

30872421 is an frugal number, since it uses more digits than its factorization.

30872421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42367 (or 42352 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 30872421 is about 5556.2956184854. The cubic root of 30872421 is about 313.7065327105.

The spelling of 30872421 in words is "thirty million, eight hundred seventy-two thousand, four hundred twenty-one".