30531402 has 48 divisors (see below), whose sum is σ = 72558720. Its totient is φ = 9201600.

The previous prime is 30531353. The next prime is 30531421. The reversal of 30531402 is 20413503.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53374 + ... + 53942.

It is an arithmetic number, because the mean of its divisors is an integer number (1511640).

Almost surely, 2^30531402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30531402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36279360).

30531402 is an abundant number, since it is smaller than the sum of its proper divisors (42027318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30531402 is a wasteful number, since it uses less digits than its factorization.

30531402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 30531402 is about 5525.5227806969. The cubic root of 30531402 is about 312.5471783704.

Adding to 30531402 its reverse (20413503), we get a palindrome (50944905).

The spelling of 30531402 in words is "thirty million, five hundred thirty-one thousand, four hundred two".