653978399 has 2 divisors, whose sum is σ = 653978400. Its totient is φ = 653978398.

The previous prime is 653978393. The next prime is 653978401. The reversal of 653978399 is 993879356.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 653978399 - 2⁴ = 653978383 is a prime.

Together with 653978401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653978393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326989199 + 326989200.

It is an arithmetic number, because the mean of its divisors is an integer number (326989200).

Almost surely, 2^653978399 is an apocalyptic number.

653978399 is a deficient number, since it is larger than the sum of its proper divisors (1).

653978399 is an equidigital number, since it uses as much as digits as its factorization.

653978399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 59.

The square root of 653978399 is about 25573.0013686309. The cubic root of 653978399 is about 868.0028169085.

The spelling of 653978399 in words is "six hundred fifty-three million, nine hundred seventy-eight thousand, three hundred ninety-nine".