1020400994 has 4 divisors (see below), whose sum is σ = 1530601494. Its totient is φ = 510200496.

The previous prime is 1020400987. The next prime is 1020401017. The reversal of 1020400994 is 4990040201.

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

It can be written as a sum of positive squares in only one way, i.e., 1019971969 + 429025 = 31937^2 + 655^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255100247 + ... + 255100250.

Almost surely, 2^1020400994 is an apocalyptic number.

1020400994 is a deficient number, since it is larger than the sum of its proper divisors (510200500).

1020400994 is an equidigital number, since it uses as much as digits as its factorization.

1020400994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510200499.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1020400994 is about 31943.7160330479. The cubic root of 1020400994 is about 1006.7546039335.

The spelling of 1020400994 in words is "one billion, twenty million, four hundred thousand, nine hundred ninety-four".