247990940 has 12 divisors (see below), whose sum is σ = 520781016. Its totient is φ = 99196368.

The previous prime is 247990931. The next prime is 247990949. The reversal of 247990940 is 49099742.

It is an interprime number because it is at equal distance from previous prime (247990931) and next prime (247990949).

It is a super-2 number, since 2×247990940² = 122999012644167200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247990891 and 247990900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247990949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6199754 + ... + 6199793.

It is an arithmetic number, because the mean of its divisors is an integer number (43398418).

Almost surely, 2^247990940 is an apocalyptic number.

247990940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247990940 is an abundant number, since it is smaller than the sum of its proper divisors (272790076).

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

247990940 is a wasteful number, since it uses less digits than its factorization.

247990940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12399556 (or 12399554 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 247990940 is about 15747.7280901087. The cubic root of 247990940 is about 628.2684796032.

The spelling of 247990940 in words is "two hundred forty-seven million, nine hundred ninety thousand, nine hundred forty".