36399421 has 4 divisors (see below), whose sum is σ = 38315200. Its totient is φ = 34483644.

The previous prime is 36399413. The next prime is 36399449. The reversal of 36399421 is 12499363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12499363 = 1931 ⋅6473.

It is a cyclic number.

It is not a de Polignac number, because 36399421 - 2³ = 36399413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36399481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 957861 + ... + 957898.

It is an arithmetic number, because the mean of its divisors is an integer number (9578800).

Almost surely, 2^36399421 is an apocalyptic number.

It is an amenable number.

36399421 is a deficient number, since it is larger than the sum of its proper divisors (1915779).

36399421 is a wasteful number, since it uses less digits than its factorization.

36399421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915778.

The product of its digits is 34992, while the sum is 37.

The square root of 36399421 is about 6033.1932672508. The cubic root of 36399421 is about 331.4094020519.

The spelling of 36399421 in words is "thirty-six million, three hundred ninety-nine thousand, four hundred twenty-one".