31420000 has 60 divisors (see below), whose sum is σ = 77347116. Its totient is φ = 12560000.

The previous prime is 31419979. The next prime is 31420009. The reversal of 31420000 is 2413.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19215 + ... + 20785.

Almost surely, 2^31420000 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 31420000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38673558).

31420000 is an abundant number, since it is smaller than the sum of its proper divisors (45927116).

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

31420000 is an equidigital number, since it uses as much as digits as its factorization.

31420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601 (or 1578 counting only the distinct ones).

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

The square root of 31420000 is about 5605.3545828966. The cubic root of 31420000 is about 315.5503940907.

Adding to 31420000 its reverse (2413), we get a palindrome (31422413).

The spelling of 31420000 in words is "thirty-one million, four hundred twenty thousand".