31250030 has 32 divisors (see below), whose sum is σ = 65111040. Its totient is φ = 10576800.

The previous prime is 31250017. The next prime is 31250039. The reversal of 31250030 is 3005213.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 31249987 and 31250014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31250039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2705 + ... + 8355.

It is an arithmetic number, because the mean of its divisors is an integer number (2034720).

Almost surely, 2^31250030 is an apocalyptic number.

31250030 is an abundant number, since it is smaller than the sum of its proper divisors (33861010).

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

31250030 is a wasteful number, since it uses less digits than its factorization.

31250030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 31250030 is about 5590.1726270304. The cubic root of 31250030 is about 314.9803632674.

Adding to 31250030 its reverse (3005213), we get a palindrome (34255243).

The spelling of 31250030 in words is "thirty-one million, two hundred fifty thousand, thirty".