189951420 has 24 divisors (see below), whose sum is σ = 531864144. Its totient is φ = 50653696.

The previous prime is 189951413. The next prime is 189951427. The reversal of 189951420 is 24159981.

It is an interprime number because it is at equal distance from previous prime (189951413) and next prime (189951427).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189951427) 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, 1582869 + ... + 1582988.

It is an arithmetic number, because the mean of its divisors is an integer number (22161006).

Almost surely, 2^189951420 is an apocalyptic number.

189951420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189951420 is an abundant number, since it is smaller than the sum of its proper divisors (341912724).

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

189951420 is a wasteful number, since it uses less digits than its factorization.

189951420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165869 (or 3165867 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 189951420 is about 13782.2864576238. The cubic root of 189951420 is about 574.8407069776.

The spelling of 189951420 in words is "one hundred eighty-nine million, nine hundred fifty-one thousand, four hundred twenty".