121615440 has 40 divisors (see below), whose sum is σ = 377008608. Its totient is φ = 32430720.

The previous prime is 121615427. The next prime is 121615453. The reversal of 121615440 is 44516121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121615427) and next prime (121615453).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121615440.

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, 253126 + ... + 253605.

Almost surely, 2^121615440 is an apocalyptic number.

121615440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121615440 is an abundant number, since it is smaller than the sum of its proper divisors (255393168).

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

121615440 is a wasteful number, since it uses less digits than its factorization.

121615440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506747 (or 506741 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 121615440 is about 11027.9390640319. The cubic root of 121615440 is about 495.4458996076.

The spelling of 121615440 in words is "one hundred twenty-one million, six hundred fifteen thousand, four hundred forty".