402154397 has 8 divisors (see below), whose sum is σ = 440494200. Its totient is φ = 365446144.

The previous prime is 402154393. The next prime is 402154429. The reversal of 402154397 is 793451204.

It can be written as a sum of positive squares in 4 ways, for example, as 13039321 + 389115076 = 3611^2 + 19726^2 .

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

It is not a de Polignac number, because 402154397 - 2² = 402154393 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 (402154391) 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, 407372 + ... + 408357.

It is an arithmetic number, because the mean of its divisors is an integer number (55061775).

Almost surely, 2^402154397 is an apocalyptic number.

It is an amenable number.

402154397 is a deficient number, since it is larger than the sum of its proper divisors (38339803).

402154397 is a wasteful number, since it uses less digits than its factorization.

402154397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815775.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 402154397 is about 20053.7875973593. The cubic root of 402154397 is about 738.1267429934.

The spelling of 402154397 in words is "four hundred two million, one hundred fifty-four thousand, three hundred ninety-seven".