157649947 has 16 divisors (see below), whose sum is σ = 197326080. Its totient is φ = 122615712.

The previous prime is 157649941. The next prime is 157649953. The reversal of 157649947 is 749946751.

It is an interprime number because it is at equal distance from previous prime (157649941) and next prime (157649953).

It is a cyclic number.

It is not a de Polignac number, because 157649947 - 2³ = 157649939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157649894 and 157649903.

It is not an unprimeable number, because it can be changed into a prime (157649941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9313 + ... + 20050.

It is an arithmetic number, because the mean of its divisors is an integer number (12332880).

Almost surely, 2^157649947 is an apocalyptic number.

157649947 is a deficient number, since it is larger than the sum of its proper divisors (39676133).

157649947 is a wasteful number, since it uses less digits than its factorization.

157649947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29442.

The product of its digits is 1905120, while the sum is 52.

The square root of 157649947 is about 12555.8730082778. The cubic root of 157649947 is about 540.2124758275.

The spelling of 157649947 in words is "one hundred fifty-seven million, six hundred forty-nine thousand, nine hundred forty-seven".