247423990 has 16 divisors (see below), whose sum is σ = 485850960. Its totient is φ = 89972320.

The previous prime is 247423987. The next prime is 247423999. The reversal of 247423990 is 99324742.

It is a super-2 number, since 2×247423990² = 122437261655040200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247423999) 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, 1124545 + ... + 1124764.

It is an arithmetic number, because the mean of its divisors is an integer number (30365685).

Almost surely, 2^247423990 is an apocalyptic number.

247423990 is a deficient number, since it is larger than the sum of its proper divisors (238426970).

247423990 is a wasteful number, since it uses less digits than its factorization.

247423990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249327.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 247423990 is about 15729.7167806671. The cubic root of 247423990 is about 627.7893376337.

It can be divided in two parts, 2474239 and 90, that added together give a square (2474329 = 1573²).

The spelling of 247423990 in words is "two hundred forty-seven million, four hundred twenty-three thousand, nine hundred ninety".