149815397 has 4 divisors (see below), whose sum is σ = 153299520. Its totient is φ = 146331276.

The previous prime is 149815387. The next prime is 149815403. The reversal of 149815397 is 793518941.

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.

It is a cyclic number.

It is not a de Polignac number, because 149815397 - 2⁶ = 149815333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149815327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741997 + ... + 1742082.

It is an arithmetic number, because the mean of its divisors is an integer number (38324880).

Almost surely, 2^149815397 is an apocalyptic number.

It is an amenable number.

149815397 is a deficient number, since it is larger than the sum of its proper divisors (3484123).

149815397 is an equidigital number, since it uses as much as digits as its factorization.

149815397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484122.

The product of its digits is 272160, while the sum is 47.

The square root of 149815397 is about 12239.9100078391. The cubic root of 149815397 is about 531.1112284919. Note that the first 3 decimals are identical.

The spelling of 149815397 in words is "one hundred forty-nine million, eight hundred fifteen thousand, three hundred ninety-seven".