149387857 has 18 divisors (see below), whose sum is σ = 162554658. Its totient is φ = 137244672.

The previous prime is 149387837. The next prime is 149387863. The reversal of 149387857 is 758783941.

It can be written as a sum of positive squares in 9 ways, for example, as 450241 + 148937616 = 671^2 + 12204^2 .

It is not a de Polignac number, because 149387857 - 2¹⁹ = 148863569 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149387827) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1540033 + ... + 1540129.

Almost surely, 2^149387857 is an apocalyptic number.

149387857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

149387857 is a deficient number, since it is larger than the sum of its proper divisors (13166801).

149387857 is an frugal number, since it uses more digits than its factorization.

149387857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 187 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The square root of 149387857 is about 12222.4325320290. The cubic root of 149387857 is about 530.6055224785.

The spelling of 149387857 in words is "one hundred forty-nine million, three hundred eighty-seven thousand, eight hundred fifty-seven".