158121400 has 24 divisors (see below), whose sum is σ = 367632720. Its totient is φ = 63248480.

The previous prime is 158121371. The next prime is 158121443. The reversal of 158121400 is 4121851.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395104 + ... + 395503.

It is an arithmetic number, because the mean of its divisors is an integer number (15318030).

Almost surely, 2^158121400 is an apocalyptic number.

158121400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158121400 is an abundant number, since it is smaller than the sum of its proper divisors (209511320).

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

158121400 is a wasteful number, since it uses less digits than its factorization.

158121400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790623 (or 790614 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 158121400 is about 12574.6331954455. The cubic root of 158121400 is about 540.7504426742.

The spelling of 158121400 in words is "one hundred fifty-eight million, one hundred twenty-one thousand, four hundred".