402172447 has 4 divisors (see below), whose sum is σ = 405931176. Its totient is φ = 398413720.

The previous prime is 402172423. The next prime is 402172481. The reversal of 402172447 is 744271204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402172447 - 2¹⁵ = 402139679 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 (402172747) 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, 1879204 + ... + 1879417.

It is an arithmetic number, because the mean of its divisors is an integer number (101482794).

Almost surely, 2^402172447 is an apocalyptic number.

402172447 is a deficient number, since it is larger than the sum of its proper divisors (3758729).

402172447 is a wasteful number, since it uses less digits than its factorization.

402172447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758728.

The product of its (nonzero) digits is 12544, while the sum is 31.

The square root of 402172447 is about 20054.2376319819. The cubic root of 402172447 is about 738.1377860062.

The spelling of 402172447 in words is "four hundred two million, one hundred seventy-two thousand, four hundred forty-seven".