121640395 has 16 divisors (see below), whose sum is σ = 148678848. Its totient is φ = 95518080.

The previous prime is 121640383. The next prime is 121640437. The reversal of 121640395 is 593046121.

It is not a de Polignac number, because 121640395 - 2⁹ = 121639883 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97717 + ... + 98953.

It is an arithmetic number, because the mean of its divisors is an integer number (9292428).

Almost surely, 2^121640395 is an apocalyptic number.

121640395 is a deficient number, since it is larger than the sum of its proper divisors (27038453).

121640395 is a wasteful number, since it uses less digits than its factorization.

121640395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 121640395 is about 11029.0704504051. The cubic root of 121640395 is about 495.4797851264.

The spelling of 121640395 in words is "one hundred twenty-one million, six hundred forty thousand, three hundred ninety-five".