31352040 has 96 divisors (see below), whose sum is σ = 103376520. Its totient is φ = 8239104.

The previous prime is 31352023. The next prime is 31352051. The reversal of 31352040 is 4025313.

It can be written as a sum of positive squares in 4 ways, for example, as 26071236 + 5280804 = 5106^2 + 2298^2 .

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, 25684 + ... + 26876.

Almost surely, 2^31352040 is an apocalyptic number.

31352040 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 31352040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51688260).

31352040 is an abundant number, since it is smaller than the sum of its proper divisors (72024480).

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

31352040 is a wasteful number, since it uses less digits than its factorization.

31352040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1276 counting only the distinct ones).

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

The square root of 31352040 is about 5599.2892406090. The cubic root of 31352040 is about 315.3227229178.

Adding to 31352040 its reverse (4025313), we get a palindrome (35377353).

The spelling of 31352040 in words is "thirty-one million, three hundred fifty-two thousand, forty".