961197840 has 400 divisors, whose sum is σ = 3626166720. Its totient is φ = 235146240.

The previous prime is 961197829. The next prime is 961197847. The reversal of 961197840 is 48791169.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (961197847) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4555335 + ... + 4555545.

Almost surely, 2^961197840 is an apocalyptic number.

961197840 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 961197840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813083360).

961197840 is an abundant number, since it is smaller than the sum of its proper divisors (2664968880).

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

961197840 is a wasteful number, since it uses less digits than its factorization.

961197840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 961197840 is about 31003.1908035286. The cubic root of 961197840 is about 986.8949546838.

The spelling of 961197840 in words is "nine hundred sixty-one million, one hundred ninety-seven thousand, eight hundred forty".