157993403 has 2 divisors, whose sum is σ = 157993404. Its totient is φ = 157993402.

The previous prime is 157993399. The next prime is 157993411. The reversal of 157993403 is 304399751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157993403 - 2² = 157993399 is a prime.

It is not a weakly prime, because it can be changed into another prime (157993103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78996701 + 78996702.

It is an arithmetic number, because the mean of its divisors is an integer number (78996702).

Almost surely, 2^157993403 is an apocalyptic number.

157993403 is a deficient number, since it is larger than the sum of its proper divisors (1).

157993403 is an equidigital number, since it uses as much as digits as its factorization.

157993403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 157993403 is about 12569.5426726671. The cubic root of 157993403 is about 540.6044933828.

The spelling of 157993403 in words is "one hundred fifty-seven million, nine hundred ninety-three thousand, four hundred three".