1990249267 has 4 divisors (see below), whose sum is σ = 1991386360. Its totient is φ = 1989112176.

The previous prime is 1990249249. The next prime is 1990249273. The reversal of 1990249267 is 7629420991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990249267 is a prime.

It is a super-2 number, since 2×1990249267² = 7922184289588074578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990249267.

It is not an unprimeable number, because it can be changed into a prime (1990249237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565917 + ... + 569422.

It is an arithmetic number, because the mean of its divisors is an integer number (497846590).

Almost surely, 2^1990249267 is an apocalyptic number.

1990249267 is a deficient number, since it is larger than the sum of its proper divisors (1137093).

1990249267 is a wasteful number, since it uses less digits than its factorization.

1990249267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137092.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 1990249267 is about 44612.2098421497. The cubic root of 1990249267 is about 1257.8701877472.

It can be divided in two parts, 19902 and 49267, that added together give a square (69169 = 263²).

The spelling of 1990249267 in words is "one billion, nine hundred ninety million, two hundred forty-nine thousand, two hundred sixty-seven".