97021440 has 120 divisors (see below), whose sum is σ = 336092328. Its totient is φ = 25866240.

The previous prime is 97021417. The next prime is 97021451. The reversal of 97021440 is 4412079.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20935 + ... + 25145.

Almost surely, 2^97021440 is an apocalyptic number.

97021440 is a gapful number since it is divisible by the number (90) 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 97021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168046164).

97021440 is an abundant number, since it is smaller than the sum of its proper divisors (239070888).

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

97021440 is a wasteful number, since it uses less digits than its factorization.

97021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240 (or 4221 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 97021440 is about 9849.9461927464. The cubic root of 97021440 is about 459.5039390936.

It can be divided in two parts, 97021 and 440, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 97021440 in words is "ninety-seven million, twenty-one thousand, four hundred forty".