31421470 has 16 divisors (see below), whose sum is σ = 56648160. Its totient is φ = 12548704.

The previous prime is 31421461. The next prime is 31421477. The reversal of 31421470 is 7412413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421477) 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, 5316 + ... + 9544.

It is an arithmetic number, because the mean of its divisors is an integer number (3540510).

Almost surely, 2^31421470 is an apocalyptic number.

31421470 is a deficient number, since it is larger than the sum of its proper divisors (25226690).

31421470 is a wasteful number, since it uses less digits than its factorization.

31421470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4979.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 31421470 is about 5605.4857059848. The cubic root of 31421470 is about 315.5553150736. Note that the first 3 decimals are identical.

Adding to 31421470 its reverse (7412413), we get a palindrome (38833883).

The spelling of 31421470 in words is "thirty-one million, four hundred twenty-one thousand, four hundred seventy".