1157623421 has 16 divisors (see below), whose sum is σ = 1238768640. Its totient is φ = 1079379840.

The previous prime is 1157623391. The next prime is 1157623433. The reversal of 1157623421 is 1243267511.

It is a cyclic number.

It is not a de Polignac number, because 1157623421 - 2¹⁸ = 1157361277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157623471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553640 + ... + 555726.

It is an arithmetic number, because the mean of its divisors is an integer number (77423040).

Almost surely, 2^1157623421 is an apocalyptic number.

It is an amenable number.

1157623421 is a deficient number, since it is larger than the sum of its proper divisors (81145219).

1157623421 is a wasteful number, since it uses less digits than its factorization.

1157623421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764.

The product of its digits is 10080, while the sum is 32.

The square root of 1157623421 is about 34023.8654623486. The cubic root of 1157623421 is about 1049.9995225999. Note that the first 3 decimals are identical.

The spelling of 1157623421 in words is "one billion, one hundred fifty-seven million, six hundred twenty-three thousand, four hundred twenty-one".