121390040 has 16 divisors (see below), whose sum is σ = 273127680. Its totient is φ = 48556000.

The previous prime is 121390019. The next prime is 121390051. The reversal of 121390040 is 40093121.

It is a super-2 number, since 2×121390040² = 29471083622403200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121389994 and 121390021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517336 + ... + 1517415.

It is an arithmetic number, because the mean of its divisors is an integer number (17070480).

Almost surely, 2^121390040 is an apocalyptic number.

121390040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121390040 is an abundant number, since it is smaller than the sum of its proper divisors (151737640).

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

121390040 is a wasteful number, since it uses less digits than its factorization.

121390040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034762 (or 3034758 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 121390040 is about 11017.7148265872. The cubic root of 121390040 is about 495.1396266317.

The spelling of 121390040 in words is "one hundred twenty-one million, three hundred ninety thousand, forty".