400038157 has 2 divisors, whose sum is σ = 400038158. Its totient is φ = 400038156.

The previous prime is 400038131. The next prime is 400038161. The reversal of 400038157 is 751830004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205463556 + 194574601 = 14334^2 + 13949^2 .

It is a cyclic number.

It is not a de Polignac number, because 400038157 - 2¹⁹ = 399513869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400038127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200019078 + 200019079.

It is an arithmetic number, because the mean of its divisors is an integer number (200019079).

Almost surely, 2^400038157 is an apocalyptic number.

It is an amenable number.

400038157 is a deficient number, since it is larger than the sum of its proper divisors (1).

400038157 is an equidigital number, since it uses as much as digits as its factorization.

400038157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 400038157 is about 20000.9539022518. The cubic root of 400038157 is about 736.8297275815.

The spelling of 400038157 in words is "four hundred million, thirty-eight thousand, one hundred fifty-seven".