31479240 has 128 divisors (see below), whose sum is σ = 107775360. Its totient is φ = 7286784.

The previous prime is 31479197. The next prime is 31479241. The reversal of 31479240 is 4297413.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31479198 and 31479207.

It is not an unprimeable number, because it can be changed into a prime (31479241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25927 + ... + 27113.

It is an arithmetic number, because the mean of its divisors is an integer number (841995).

Almost surely, 2^31479240 is an apocalyptic number.

31479240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31479240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53887680).

31479240 is an abundant number, since it is smaller than the sum of its proper divisors (76296120).

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

31479240 is a wasteful number, since it uses less digits than its factorization.

31479240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 31479240 is about 5610.6363275479. The cubic root of 31479240 is about 315.7485849398.

The spelling of 31479240 in words is "thirty-one million, four hundred seventy-nine thousand, two hundred forty".