121279690 has 32 divisors (see below), whose sum is σ = 260340480. Its totient is φ = 39773184.

The previous prime is 121279687. The next prime is 121279699. The reversal of 121279690 is 96972121.

It is a super-2 number, since 2×121279690² = 29417526412992200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121279699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36055 + ... + 39274.

It is an arithmetic number, because the mean of its divisors is an integer number (8135640).

Almost surely, 2^121279690 is an apocalyptic number.

121279690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121279690 is an abundant number, since it is smaller than the sum of its proper divisors (139060790).

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

121279690 is a wasteful number, since it uses less digits than its factorization.

121279690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75366.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 121279690 is about 11012.7058437062. The cubic root of 121279690 is about 494.9895450637.

The spelling of 121279690 in words is "one hundred twenty-one million, two hundred seventy-nine thousand, six hundred ninety".