149393657 has 4 divisors (see below), whose sum is σ = 170735616. Its totient is φ = 128051700.

The previous prime is 149393641. The next prime is 149393659. The reversal of 149393657 is 756393941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756393941 = 1931 ⋅391711.

It is not a de Polignac number, because 149393657 - 2⁴ = 149393641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149393659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10670969 + ... + 10670982.

It is an arithmetic number, because the mean of its divisors is an integer number (42683904).

Almost surely, 2^149393657 is an apocalyptic number.

It is an amenable number.

149393657 is a deficient number, since it is larger than the sum of its proper divisors (21341959).

149393657 is an equidigital number, since it uses as much as digits as its factorization.

149393657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21341958.

The product of its digits is 612360, while the sum is 47.

The square root of 149393657 is about 12222.6697983706. The cubic root of 149393657 is about 530.6123893289.

The spelling of 149393657 in words is "one hundred forty-nine million, three hundred ninety-three thousand, six hundred fifty-seven".