31390480 has 40 divisors (see below), whose sum is σ = 79619904. Its totient is φ = 11414400.

The previous prime is 31390477. The next prime is 31390481. The reversal of 31390480 is 8409313.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (31390481) 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, 16956 + ... + 18715.

Almost surely, 2^31390480 is an apocalyptic number.

It is an amenable number.

31390480 is an abundant number, since it is smaller than the sum of its proper divisors (48229424).

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

31390480 is a wasteful number, since it uses less digits than its factorization.

31390480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35695 (or 35689 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31390480 is about 5602.7207676271. The cubic root of 31390480 is about 315.4515402141.

Adding to 31390480 its reverse (8409313), we get a palindrome (39799793).

The spelling of 31390480 in words is "thirty-one million, three hundred ninety thousand, four hundred eighty".