31447040 has 96 divisors (see below), whose sum is σ = 78427440. Its totient is φ = 12091392.

The previous prime is 31447027. The next prime is 31447043. The reversal of 31447040 is 4074413.

It is a junction number, because it is equal to n+sod(n) for n = 31446997 and 31447015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31447043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378839 + ... + 378921.

Almost surely, 2^31447040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31447040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39213720).

31447040 is an abundant number, since it is smaller than the sum of its proper divisors (46980400).

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

31447040 is an equidigital number, since it uses as much as digits as its factorization.

31447040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31447040 is about 5607.7660436220. The cubic root of 31447040 is about 315.6408888515.

The spelling of 31447040 in words is "thirty-one million, four hundred forty-seven thousand, forty".