840401154 has 24 divisors (see below), whose sum is σ = 1927979820. Its totient is φ = 263655168.

The previous prime is 840401147. The next prime is 840401161. The reversal of 840401154 is 451104048.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (840401147) and next prime (840401161).

It can be written as a sum of positive squares in 2 ways, for example, as 836539929 + 3861225 = 28923^2 + 1965^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1372899 + ... + 1373510.

Almost surely, 2^840401154 is an apocalyptic number.

840401154 is an abundant number, since it is smaller than the sum of its proper divisors (1087578666).

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

840401154 is a wasteful number, since it uses less digits than its factorization.

840401154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746434 (or 2746431 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 840401154 is about 28989.6732303074. The cubic root of 840401154 is about 943.6889723033.

The spelling of 840401154 in words is "eight hundred forty million, four hundred one thousand, one hundred fifty-four".