157878381 has 16 divisors (see below), whose sum is σ = 218234880. Its totient is φ = 101416560.

The previous prime is 157878359. The next prime is 157878401. The reversal of 157878381 is 183878751.

It is a happy number.

It is not a de Polignac number, because 157878381 - 2¹¹ = 157876333 is a prime.

It is a super-2 number, since 2×157878381² = 49851166374362322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157878381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157828381) 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, 18676 + ... + 25778.

It is an arithmetic number, because the mean of its divisors is an integer number (13639680).

Almost surely, 2^157878381 is an apocalyptic number.

It is an amenable number.

157878381 is a deficient number, since it is larger than the sum of its proper divisors (60356499).

157878381 is a wasteful number, since it uses less digits than its factorization.

157878381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376.

The product of its digits is 376320, while the sum is 48.

The square root of 157878381 is about 12564.9664145990. The cubic root of 157878381 is about 540.4732716468.

The spelling of 157878381 in words is "one hundred fifty-seven million, eight hundred seventy-eight thousand, three hundred eighty-one".