159699640 has 32 divisors (see below), whose sum is σ = 362692080. Its totient is φ = 63281152.

The previous prime is 159699637. The next prime is 159699643. The reversal of 159699640 is 46996951.

It is an interprime number because it is at equal distance from previous prime (159699637) and next prime (159699643).

It is a super-2 number, since 2×159699640² = 51007950032259200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159699643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14377 + ... + 22936.

Almost surely, 2^159699640 is an apocalyptic number.

159699640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

159699640 is an abundant number, since it is smaller than the sum of its proper divisors (202992440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

159699640 is a wasteful number, since it uses less digits than its factorization.

159699640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37431 (or 37427 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 159699640 is about 12637.2322919222. The cubic root of 159699640 is about 542.5436011592.

The spelling of 159699640 in words is "one hundred fifty-nine million, six hundred ninety-nine thousand, six hundred forty".