402172026 has 32 divisors (see below), whose sum is σ = 855525888. Its totient is φ = 125598720.

The previous prime is 402171983. The next prime is 402172027. The reversal of 402172026 is 620271204.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 402171987 and 402172005.

It is not an unprimeable number, because it can be changed into a prime (402172027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13906 + ... + 31586.

It is an arithmetic number, because the mean of its divisors is an integer number (26735184).

Almost surely, 2^402172026 is an apocalyptic number.

402172026 is an abundant number, since it is smaller than the sum of its proper divisors (453353862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402172026 is a wasteful number, since it uses less digits than its factorization.

402172026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17926.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 402172026 is about 20054.2271354445. The cubic root of 402172026 is about 738.1375284416.

The spelling of 402172026 in words is "four hundred two million, one hundred seventy-two thousand, twenty-six".