31421004 has 24 divisors (see below), whose sum is σ = 74876928. Its totient is φ = 10250640.

The previous prime is 31420969. The next prime is 31421009. The reversal of 31421004 is 40012413.

It is not an unprimeable number, because it can be changed into a prime (31421009) 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, 27292 + ... + 28419.

It is an arithmetic number, because the mean of its divisors is an integer number (3119872).

Almost surely, 2^31421004 is an apocalyptic number.

It is an amenable number.

31421004 is an abundant number, since it is smaller than the sum of its proper divisors (43455924).

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

31421004 is a wasteful number, since it uses less digits than its factorization.

31421004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55765 (or 55763 counting only the distinct ones).

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

The square root of 31421004 is about 5605.4441394059. Note that the first 3 decimals coincide. The cubic root of 31421004 is about 315.5537551052.

Adding to 31421004 its reverse (40012413), we get a palindrome (71433417).

The spelling of 31421004 in words is "thirty-one million, four hundred twenty-one thousand, four".