308257940 has 24 divisors (see below), whose sum is σ = 685421352. Its totient is φ = 116049920.

The previous prime is 308257877. The next prime is 308257951. The reversal of 308257940 is 49752803.

It can be written as a sum of positive squares in 4 ways, for example, as 83137924 + 225120016 = 9118^2 + 15004^2 .

It is a junction number, because it is equal to n+sod(n) for n = 308257894 and 308257903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452981 + ... + 453660.

It is an arithmetic number, because the mean of its divisors is an integer number (28559223).

Almost surely, 2^308257940 is an apocalyptic number.

It is an amenable number.

308257940 is an abundant number, since it is smaller than the sum of its proper divisors (377163412).

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

308257940 is a wasteful number, since it uses less digits than its factorization.

308257940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906667 (or 906665 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 308257940 is about 17557.2759846167. The cubic root of 308257940 is about 675.5198117574.

The spelling of 308257940 in words is "three hundred eight million, two hundred fifty-seven thousand, nine hundred forty".