397020240 has 120 divisors (see below), whose sum is σ = 1340771328. Its totient is φ = 105281280.

The previous prime is 397020163. The next prime is 397020287. The reversal of 397020240 is 42020793.

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 23 ways as a sum of consecutive naturals, for example, 136077 + ... + 138963.

Almost surely, 2^397020240 is an apocalyptic number.

397020240 is a gapful number since it is divisible by the number (30) 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 397020240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670385664).

397020240 is an abundant number, since it is smaller than the sum of its proper divisors (943751088).

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

397020240 is a wasteful number, since it uses less digits than its factorization.

397020240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097 (or 3088 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 397020240 is about 19925.3667469384. The cubic root of 397020240 is about 734.9721494376.

The spelling of 397020240 in words is "three hundred ninety-seven million, twenty thousand, two hundred forty".