121390390 has 16 divisors (see below), whose sum is σ = 238366800. Its totient is φ = 44141920.

The previous prime is 121390369. The next prime is 121390391. The reversal of 121390390 is 93093121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121390391) 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, 551665 + ... + 551884.

It is an arithmetic number, because the mean of its divisors is an integer number (14897925).

Almost surely, 2^121390390 is an apocalyptic number.

121390390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121390390 is a deficient number, since it is larger than the sum of its proper divisors (116976410).

121390390 is a wasteful number, since it uses less digits than its factorization.

121390390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103567.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 121390390 is about 11017.7307100873. The cubic root of 121390390 is about 495.1401025047.

The spelling of 121390390 in words is "one hundred twenty-one million, three hundred ninety thousand, three hundred ninety".