149677643 has 4 divisors (see below), whose sum is σ = 151130928. Its totient is φ = 148224360.

The previous prime is 149677609. The next prime is 149677663. The reversal of 149677643 is 346776941.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346776941 = 7 ⋅49539563.

It is a cyclic number.

It is not a de Polignac number, because 149677643 - 2²⁰ = 148629067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149677663) 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, 726488 + ... + 726693.

It is an arithmetic number, because the mean of its divisors is an integer number (37782732).

Almost surely, 2^149677643 is an apocalyptic number.

149677643 is a deficient number, since it is larger than the sum of its proper divisors (1453285).

149677643 is a wasteful number, since it uses less digits than its factorization.

149677643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453284.

The product of its digits is 762048, while the sum is 47.

The square root of 149677643 is about 12234.2814664368. The cubic root of 149677643 is about 530.9483944680.

The spelling of 149677643 in words is "one hundred forty-nine million, six hundred seventy-seven thousand, six hundred forty-three".