31244430 has 32 divisors (see below), whose sum is σ = 85699584. Its totient is φ = 7141536.

The previous prime is 31244399. The next prime is 31244431. The reversal of 31244430 is 3444213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31244397 and 31244406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244431) 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, 74182 + ... + 74601.

It is an arithmetic number, because the mean of its divisors is an integer number (2678112).

Almost surely, 2^31244430 is an apocalyptic number.

31244430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31244430 is an abundant number, since it is smaller than the sum of its proper divisors (54455154).

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

31244430 is a wasteful number, since it uses less digits than its factorization.

31244430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148800.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 31244430 is about 5589.6717256025. The cubic root of 31244430 is about 314.9615473344.

Adding to 31244430 its reverse (3444213), we get a palindrome (34688643).

The spelling of 31244430 in words is "thirty-one million, two hundred forty-four thousand, four hundred thirty".