121639395 has 32 divisors (see below), whose sum is σ = 198342144. Its totient is φ = 63648000.

The previous prime is 121639393. The next prime is 121639411. The reversal of 121639395 is 593936121.

It is not a de Polignac number, because 121639395 - 2¹ = 121639393 is a prime.

It is a super-2 number, since 2×121639395² = 29592284831932050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121639391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202095 + ... + 202695.

It is an arithmetic number, because the mean of its divisors is an integer number (6198192).

Almost surely, 2^121639395 is an apocalyptic number.

121639395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121639395 is a deficient number, since it is larger than the sum of its proper divisors (76702749).

121639395 is a wasteful number, since it uses less digits than its factorization.

121639395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843.

The product of its digits is 43740, while the sum is 39.

The square root of 121639395 is about 11029.0251155757. The cubic root of 121639395 is about 495.4784273507.

The spelling of 121639395 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, three hundred ninety-five".