247402989 has 24 divisors (see below), whose sum is σ = 384808320. Its totient is φ = 152596608.

The previous prime is 247402963. The next prime is 247402999. The reversal of 247402989 is 989204742.

It is not a de Polignac number, because 247402989 - 2⁷ = 247402861 is a prime.

It is a super-2 number, since 2×247402989² = 122416477932268242, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247402999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4677 + ... + 22730.

It is an arithmetic number, because the mean of its divisors is an integer number (16033680).

Almost surely, 2^247402989 is an apocalyptic number.

It is an amenable number.

247402989 is a deficient number, since it is larger than the sum of its proper divisors (137405331).

247402989 is a wasteful number, since it uses less digits than its factorization.

247402989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27489 (or 27486 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 247402989 is about 15729.0492083915. The cubic root of 247402989 is about 627.7715751727.

The spelling of 247402989 in words is "two hundred forty-seven million, four hundred two thousand, nine hundred eighty-nine".