149257747 has 4 divisors (see below), whose sum is σ = 149322816. Its totient is φ = 149192680.

The previous prime is 149257729. The next prime is 149257769. The reversal of 149257747 is 747752941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747752941 = 13 ⋅57519457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149257747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 149257697 and 149257706.

It is not an unprimeable number, because it can be changed into a prime (149257727) 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, 28963 + ... + 33724.

It is an arithmetic number, because the mean of its divisors is an integer number (37330704).

Almost surely, 2^149257747 is an apocalyptic number.

149257747 is a deficient number, since it is larger than the sum of its proper divisors (65069).

149257747 is an equidigital number, since it uses as much as digits as its factorization.

149257747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65068.

The product of its digits is 493920, while the sum is 46.

The square root of 149257747 is about 12217.1087823593. The cubic root of 149257747 is about 530.4514333436.

The spelling of 149257747 in words is "one hundred forty-nine million, two hundred fifty-seven thousand, seven hundred forty-seven".