1961667 has 12 divisors (see below), whose sum is σ = 2849704. Its totient is φ = 1300320.

The previous prime is 1961657. The next prime is 1961669. The reversal of 1961667 is 7661691.

It is not a de Polignac number, because 1961667 - 2⁴ = 1961651 is a prime.

It is a Duffinian number.

1961667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1961669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1383 + ... + 2415.

2^1961667 is an apocalyptic number.

1961667 is a deficient number, since it is larger than the sum of its proper divisors (888037).

1961667 is a wasteful number, since it uses less digits than its factorization.

1961667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250 (or 1247 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 1961667 is about 1400.5952306073. The cubic root of 1961667 is about 125.1819643167.

It can be divided in two parts, 19616 and 67, that added together give a 9-th power (19683 = 3⁹).

The spelling of 1961667 in words is "one million, nine hundred sixty-one thousand, six hundred sixty-seven".