153971994 has 32 divisors (see below), whose sum is σ = 337821120. Its totient is φ = 46396800.

The previous prime is 153971989. The next prime is 153971999. The reversal of 153971994 is 499179351.

153971994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (153971989) and next prime (153971999).

It is not an unprimeable number, because it can be changed into a prime (153971999) 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, 5502 + ... + 18390.

It is an arithmetic number, because the mean of its divisors is an integer number (10556910).

Almost surely, 2^153971994 is an apocalyptic number.

153971994 is an abundant number, since it is smaller than the sum of its proper divisors (183849126).

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

153971994 is a wasteful number, since it uses less digits than its factorization.

153971994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13086.

The product of its digits is 306180, while the sum is 48.

The square root of 153971994 is about 12408.5452007880. The cubic root of 153971994 is about 535.9783466600.

It can be divided in two parts, 15397 and 1994, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 153971994 in words is "one hundred fifty-three million, nine hundred seventy-one thousand, nine hundred ninety-four".