31401240 has 64 divisors (see below), whose sum is σ = 101455200. Its totient is φ = 7729152.

The previous prime is 31401239. The next prime is 31401257. The reversal of 31401240 is 4210413.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8505 + ... + 11624.

Almost surely, 2^31401240 is an apocalyptic number.

31401240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31401240 is an abundant number, since it is smaller than the sum of its proper divisors (70053960).

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

31401240 is a wasteful number, since it uses less digits than its factorization.

31401240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20156 (or 20152 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31401240 is about 5603.6809331010. The cubic root of 31401240 is about 315.4875794933.

Adding to 31401240 its reverse (4210413), we get a palindrome (35611653).

The spelling of 31401240 in words is "thirty-one million, four hundred one thousand, two hundred forty".