406997890 has 64 divisors (see below), whose sum is σ = 826005600. Its totient is φ = 143345664.

The previous prime is 406997869. The next prime is 406997893. The reversal of 406997890 is 98799604.

It can be written as a sum of positive squares in 16 ways, for example, as 39853969 + 367143921 = 6313^2 + 19161^2 .

It is not an unprimeable number, because it can be changed into a prime (406997893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334924 + ... + 336136.

Almost surely, 2^406997890 is an apocalyptic number.

406997890 is an abundant number, since it is smaller than the sum of its proper divisors (419007710).

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

406997890 is a wasteful number, since it uses less digits than its factorization.

406997890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 406997890 is about 20174.1887073557. The cubic root of 406997890 is about 741.0782248865.

The spelling of 406997890 in words is "four hundred six million, nine hundred ninety-seven thousand, eight hundred ninety".