40456421 has 8 divisors (see below), whose sum is σ = 42826080. Its totient is φ = 38151792.

The previous prime is 40456397. The next prime is 40456433. The reversal of 40456421 is 12465404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40456421 - 2¹⁸ = 40194277 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 (40456021) 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, 14975 + ... + 17468.

It is an arithmetic number, because the mean of its divisors is an integer number (5353260).

Almost surely, 2^40456421 is an apocalyptic number.

It is an amenable number.

40456421 is a deficient number, since it is larger than the sum of its proper divisors (2369659).

40456421 is a wasteful number, since it uses less digits than its factorization.

40456421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32515.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 40456421 is about 6360.5362195337. The cubic root of 40456421 is about 343.2910544812.

The spelling of 40456421 in words is "forty million, four hundred fifty-six thousand, four hundred twenty-one".