121439730 has 16 divisors (see below), whose sum is σ = 291455424. Its totient is φ = 32383920.

The previous prime is 121439729. The next prime is 121439737. The reversal of 121439730 is 37934121.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 4047991 = 121439730 / (1 + 2 + 1 + 4 + 3 + 9 + 7 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (121439737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2023966 + ... + 2024025.

It is an arithmetic number, because the mean of its divisors is an integer number (18215964).

Almost surely, 2^121439730 is an apocalyptic number.

121439730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121439730 is an abundant number, since it is smaller than the sum of its proper divisors (170015694).

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

121439730 is a wasteful number, since it uses less digits than its factorization.

121439730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4048001.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 121439730 is about 11019.9696006840. The cubic root of 121439730 is about 495.2071778403.

The spelling of 121439730 in words is "one hundred twenty-one million, four hundred thirty-nine thousand, seven hundred thirty".