167421440 has 80 divisors (see below), whose sum is σ = 425142432. Its totient is φ = 63012864.

The previous prime is 167421431. The next prime is 167421481. The reversal of 167421440 is 44124761.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41597 + ... + 45443.

Almost surely, 2^167421440 is an apocalyptic number.

167421440 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 167421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212571216).

167421440 is an abundant number, since it is smaller than the sum of its proper divisors (257720992).

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

167421440 is an equidigital number, since it uses as much as digits as its factorization.

167421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887 (or 3871 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 167421440 is about 12939.1437120081. The cubic root of 167421440 is about 551.1506928059.

The spelling of 167421440 in words is "one hundred sixty-seven million, four hundred twenty-one thousand, four hundred forty".