31040200 has 24 divisors (see below), whose sum is σ = 72168930. Its totient is φ = 12416000.

The previous prime is 31040173. The next prime is 31040201. The reversal of 31040200 is 204013.

It can be written as a sum of positive squares in 3 ways, for example, as 19027044 + 12013156 = 4362^2 + 3466^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (31040201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77401 + ... + 77800.

Almost surely, 2^31040200 is an apocalyptic number.

It is an amenable number.

31040200 is an abundant number, since it is smaller than the sum of its proper divisors (41128730).

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

31040200 is a wasteful number, since it uses less digits than its factorization.

31040200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155217 (or 155208 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 31040200 is about 5571.3732597987. The cubic root of 31040200 is about 314.2737952977.

Adding to 31040200 its reverse (204013), we get a palindrome (31244213).

The spelling of 31040200 in words is "thirty-one million, forty thousand, two hundred".