402452621 has 4 divisors (see below), whose sum is σ = 406360032. Its totient is φ = 398545212.

The previous prime is 402452593. The next prime is 402452651. The reversal of 402452621 is 126254204.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402452621 is a prime.

It is a super-2 number, since 2×402452621² = 323936224299539282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402452651) 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, 1953551 + ... + 1953756.

It is an arithmetic number, because the mean of its divisors is an integer number (101590008).

Almost surely, 2^402452621 is an apocalyptic number.

It is an amenable number.

402452621 is a deficient number, since it is larger than the sum of its proper divisors (3907411).

402452621 is a wasteful number, since it uses less digits than its factorization.

402452621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907410.

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

The square root of 402452621 is about 20061.2218222121. The cubic root of 402452621 is about 738.3091544594.

The spelling of 402452621 in words is "four hundred two million, four hundred fifty-two thousand, six hundred twenty-one".