157121980 has 48 divisors (see below), whose sum is σ = 342054720. Its totient is φ = 60576768.

The previous prime is 157121977. The next prime is 157121983. The reversal of 157121980 is 89121751.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (157121977) and next prime (157121983).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157121983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82681 + ... + 84559.

It is an arithmetic number, because the mean of its divisors is an integer number (7126140).

Almost surely, 2^157121980 is an apocalyptic number.

157121980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157121980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171027360).

157121980 is an abundant number, since it is smaller than the sum of its proper divisors (184932740).

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

157121980 is a wasteful number, since it uses less digits than its factorization.

157121980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038 (or 2036 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 157121980 is about 12534.8306729688. The cubic root of 157121980 is about 539.6087472249.

The spelling of 157121980 in words is "one hundred fifty-seven million, one hundred twenty-one thousand, nine hundred eighty".