31401040 has 80 divisors (see below), whose sum is σ = 84369600. Its totient is φ = 10741760.

The previous prime is 31401037. The next prime is 31401043. The reversal of 31401040 is 4010413.

It is an interprime number because it is at equal distance from previous prime (31401037) and next prime (31401043).

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 31401040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401043) 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, 13911 + ... + 16009.

It is an arithmetic number, because the mean of its divisors is an integer number (1054620).

Almost surely, 2^31401040 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 31401040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42184800).

31401040 is an abundant number, since it is smaller than the sum of its proper divisors (52968560).

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

31401040 is a wasteful number, since it uses less digits than its factorization.

31401040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140 (or 2134 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31401040 is about 5603.6630876597. The cubic root of 31401040 is about 315.4869096934.

Adding to 31401040 its reverse (4010413), we get a palindrome (35411453).

The spelling of 31401040 in words is "thirty-one million, four hundred one thousand, forty".